I have not quit opiates in totality but the reason I quit my opiate of choice (pods) was because they gave me a pretty extreme case of hypersomnia. I'm the type of person that tends to believe that drugs don't ruin peoples lives, that people ruin peoples lives. Almost like the gun arguement. A gun can kill a person or save a persons life, what determines that is the person. Same way opiates can ruin a persons life or save it, its what the person does that matters imo.
But still with that said no matter how hard I tried, my body just always needed 10-12 hours of sleep every night. Sometimes as much as 14-16. And that side effect put me in a rut of complete lack of productivity and being inable to live a functional life. Now I'm on sub, I do not need to sleep more than 8 hours, and I don't feel like I'm sedated and slowed down on it. I know my metabolism is which is why its hard as fuck to lose weight, but for now sub works so I have no reason whatsoever to quit that yet.